Apply Keith Park's updates for expected/horology-solaris-1947.out. Fix

erroneous expected output for RESET DateStyle: should be ISO now.
Fix run_check.sh so that test postmaster is started with PGDATESTYLE=ISO,
else the horology test won't pass.

Author: tglsfdc

src/test/regress/expected/horology-no-DST-before-1970.out

@@ -1125,4 +1125,4 @@ SELECT '' AS eight, f1 AS european_sql FROM ABSTIME_TBL;
 
 RESET DateStyle;
 SHOW DateStyle;
-NOTICE:  DateStyle is Postgres with US (NonEuropean) conventions
+NOTICE:  DateStyle is ISO with US (NonEuropean) conventions